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157 lines
8.5 KiB
XML
157 lines
8.5 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="glGetActiveAtomicCounterBufferiv">
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<refentryinfo>
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<copyright>
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<year>2011-2013</year>
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<holder>Khronos Group.</holder>
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</copyright>
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</refentryinfo>
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<refmeta>
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<refentrytitle>glGetActiveAtomicCounterBufferiv</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetActiveAtomicCounterBufferiv</refname>
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<refpurpose>retrieve information about the set of active atomic counter buffers for a program</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glGetActiveAtomicCounterBufferiv</function></funcdef>
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<paramdef>Gluint <parameter>program</parameter></paramdef>
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<paramdef>GLuint <parameter>bufferIndex</parameter></paramdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLint *<parameter>params</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>program</parameter></term>
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<listitem>
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<para>
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The name of a program object from which to retrieve information.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>bufferIndex</parameter></term>
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<listitem>
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<para>
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Specifies index of an active atomic counter buffer.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>pname</parameter></term>
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<listitem>
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<para>
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Specifies which parameter of the atomic counter buffer to retrieve.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>params</parameter></term>
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<listitem>
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<para>
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Specifies the address of a variable into which to write the retrieved information.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para>
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<function>glGetActiveAtomicCounterBufferiv</function> retrieves information about the set of active
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atomic counter buffers for a program object. <parameter>program</parameter> is the name of a program
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object for which the command <citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry>
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has been issued in the past. It is not necessary for <parameter>program</parameter> to have been linked
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successfully. The link may have failed because the number of active atomic counters exceeded the limits.
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</para>
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<para>
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<parameter>bufferIndex</parameter> specifies the index of an active atomic counter buffer and must be in
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the range zero to the value of <constant>GL_ACTIVE_ATOMIC_COUNTER_BUFFERS</constant> minus one. The value
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of <constant>GL_ACTIVE_ATOMIC_COUNTER_BUFFERS</constant> for <parameter>program</parameter> indicates the
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number of active atomic counter buffer and can be queried with
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<citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>.
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</para>
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<para>
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If no error occurs, the parameter(s) specified by <parameter>pname</parameter> are returned in <parameter>params</parameter>.
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If an error is generated, the contents of <parameter>params</parameter> are not modified.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_ATOMIC_COUNTER_BUFFER_BINDING</constant>, then the index of the
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counter buffer binding point associated with the active atomic counter buffer <parameter>bufferIndex</parameter>
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for <parameter>program</parameter> is returned.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_ATOMIC_COUNTER_BUFFER_DATA_SIZE</constant>, then the implementation-dependent
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minimum total buffer object size, in baseic machine units, required to hold all active atomic counters in the
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atomic counter binding point identified by <parameter>bufferIndex</parameter> is returned.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTERS</constant>, then the number of active
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atomic counters for the atomic counter buffer identified by <parameter>bufferIndex</parameter> is returned.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTER_INDICES</constant>,
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then a list of the active atomic counter indices for the atomic counter buffer identified by <parameter>bufferIndex</parameter>
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is returned. The number of elements that will be written into <parameter>params</parameter> is the value of
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<constant>GL_ATOMIC_COUNTER_BUFFER_ACTIVE_ATOMIC_COUNTERS</constant> for <parameter>bufferIndex</parameter>.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_VERTEX_SHADER</constant>,
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<constant>GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_TESS_CONTROL_SHADER</constant>,
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<constant>GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_TESS_EVALUATION_SHADER</constant>,
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<constant>GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_GEOMETRY_SHADER</constant>,
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<constant>GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_FRAGMENT_SHADER</constant>,
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<constant>GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_COMPUTE_SHADER</constant> then a boolean value indicating
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whether the atomic counter buffer identified by <parameter>bufferIndex</parameter> is referenced by the vertex,
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tessellation control, tessellation evaluation, geometry, fragment or compute processing stages of <parameter>program</parameter>,
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respectively, is returned.
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</para>
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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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<function>glGetActiveAtomicCounterBufferiv</function> is available only if the
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GL version is 4.2 or higher.
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</para>
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<para>
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<constant>GL_ATOMIC_COUNTER_BUFFER_REFERENCED_BY_COMPUTE_SHADER</constant> is available
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only of the GL version is 4.3 or higher.
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</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>program</parameter> is not the name of a program
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object for which <citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry> has been called in the past.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>bufferIndex</parameter> is greater than or equal to
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the value of <constant>GL_ACTIVE_ATOMIC_COUNTER_BUFFERS</constant> for <parameter>program</parameter>.
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</para>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>pname</parameter> is not one of the accepted tokens.
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</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glGetProgram</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetActiveSubroutineUniform</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetActiveSubroutineUniformName</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetUniformLocation</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 2011-2013 Khronos Group.
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This material may be distributed subject to the terms and conditions set forth in
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the Open Publication License, v 1.0, 8 June 1999.
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<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
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</para>
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</refsect1>
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</refentry>
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